Class: ASSLine

Inherits:
Object
  • Object
show all
Defined in:
lib/vtt2ass/ass_line.rb

Overview

This class defines an ASS subtile line.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(style, time_start, time_end, text) ⇒ ASSLine

This method creates an instance of an ASSLine.

  • Requires a style name as input.

  • Requires time_start, a VTT formatted timestamp as input.

  • Requires time_start, a VTT formatted timestamp as input.

  • Requires text, a VTT formatted string as input.



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# File 'lib/vtt2ass/ass_line.rb', line 17

def initialize(style, time_start, time_end, text)
  @style = style
  @time_start = convert_time(time_start)
  @time_end = convert_time(time_end)
  @text = convert_to_ass_text(text)
end

Instance Attribute Details

#style ⇒ Object (readonly)

Returns the value of attribute style.



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# File 'lib/vtt2ass/ass_line.rb', line 8

def style
  @style
end

#text ⇒ Object (readonly)

Returns the value of attribute text.



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# File 'lib/vtt2ass/ass_line.rb', line 8

def text
  @text
end

#time_end ⇒ Object (readonly)

Returns the value of attribute time_end.



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# File 'lib/vtt2ass/ass_line.rb', line 8

def time_end
  @time_end
end

#time_start ⇒ Object (readonly)

Returns the value of attribute time_start.



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# File 'lib/vtt2ass/ass_line.rb', line 8

def time_start
  @time_start
end

Instance Method Details

#convert_time(time) ⇒ Object

This method validates the time format and sends the matching time to be converted

  • Requires str, a VTT formatted time string.



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# File 'lib/vtt2ass/ass_line.rb', line 58

def convert_time(time)
  matched_time = time.match(/([\d:]*)\.?(\d*)/)
  to_subs_time(matched_time[0])
end

#convert_to_ass_text(text) ⇒ Object

This method replaces characters and tags to ASS compatible characters and tags.

  • Requires text, a string of VTT formated text as input.



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# File 'lib/vtt2ass/ass_line.rb', line 34

def convert_to_ass_text(text)
  decoder = HTMLEntities.new
  text =
    text
    .gsub(/\r/, '')
    .gsub(/\n/, '\\N')
    .gsub(/\\n/, '\\N')
    .gsub(/\\N +/, '\\N')
    .gsub(/ +\\N/, '\\N')
    .gsub(/(\\N)+/, '\\N')
    .gsub(%r{<b[^>]*>([^<]*)</b>}) { |_s| "{\\b1}#{Regexp.last_match(1)}{\\b0}" }
    .gsub(%r{<i[^>]*>([^<]*)</i>}) { |_s| "{\\i1}#{Regexp.last_match(1)}{\\i0}" }
    .gsub(%r{<u[^>]*>([^<]*)</u>}) { |_s| "{\\u1}#{Regexp.last_match(1)}{\\u0}" }
    .gsub(%r{<c[^>]*>([^<]*)</c>}) { |_s| Regexp.last_match(1) }
    .gsub(/<[^>]>/, '')
    .gsub(/\\N$/, '')
    .gsub(/ +$/, '')
  decoder.decode(text)
end

#pad_time_num(sep, input, pad) ⇒ Object

This method pads text so that time numbers are a fixed number of digit.

  • Requires sep, a string separator.

  • Requires input, an integer.

  • Requires pad, an integer for the number of digits to be padded.



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# File 'lib/vtt2ass/ass_line.rb', line 94

def pad_time_num(sep, input, pad)
  sep + input.to_s.rjust(pad, '0')
end

#to_s ⇒ Object

This method assigns the object values and outputs an ASS dialogue line.



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# File 'lib/vtt2ass/ass_line.rb', line 26

def to_s
  "Dialogue: 0,#{@time_start},#{@time_end},#{@style},,0,0,0,,#{@text}"
end

#to_subs_time(str) ⇒ Object

This method converts time from VTT format to the ASS format.

  • Requires str, a VTT formatted time string.



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# File 'lib/vtt2ass/ass_line.rb', line 67

def to_subs_time(str)
  n = []
  x = str.split(/[:.]/).map(&:to_i)

  ms_len = 2
  h_len = 1

  x[3] = "0.#{x[3].to_s.rjust(3, '0')}"
  sx = (x[0] * 60 * 60) + (x[1] * 60) + x[2] + x[3].to_f
  sx = format('%.2f', sx).split('.')

  n.unshift(pad_time_num('.', sx[1], ms_len))
  sx = sx[0].to_f

  n.unshift(pad_time_num(':', (sx % 60).to_i, 2))
  n.unshift(pad_time_num(':', (sx / 60).floor % 60, 2))
  n.unshift(pad_time_num('',  (sx / 3600).floor % 60, h_len))

  n.join
end